<script lang="ts" setup name="GoodsImage">
import { ref } from 'vue';
import {useMouseInElement} from '@vueuse/core'
import { computed } from 'vue';
defineProps<{
  images:string[]
}>()


// 设置初始值
const current = ref(0)

// 大图与遮罩层的显示与隐藏
const target = ref(null)
const {isOutside,elementX,elementY} = useMouseInElement(target)

// 计算属性设置遮罩层的坐标
const position = computed(()=>{
   let x = elementX.value - 100
   let y = elementY.value - 100

   if(x<0) x = 0
   if(y<0) y = 0
   if(x>200) x = 200
   if(y>200) y = 200

   return {
    x,
    y
   }

})

</script>
<template>
  <div class="goods-image">
    <!-- 放大的盒子 -->
    <div 
    class="large" 
    :style="[{backgroundImage:`url(${images[current]})`},{backgroundPosition:`${-position.x*2}px ${-position.y*2}px`}]" 
    v-show="!isOutside">
    </div>

    <div class="middle">
      <img :src="images[current]"alt=""  ref="target"/>
      <!-- 遮罩层 -->
      <div class="layer" v-show="!isOutside" :style="{left:position.x+'px',top:position.y+'px'}"></div>
    </div>
    <ul class="small">
      <li 
      v-for="item,index in images" 
      :key="index" 
      :class="{active:index===current}"
      @mouseenter="current=index" 
      >
        <img
          :src="item"
          alt=""
        />
      </li>
    </ul>
  </div>
</template>

<style scoped lang="less">
.goods-image {
  width: 480px;
  height: 400px;
  position: relative;
  display: flex;
  z-index: 500;
  .large {
    position: absolute;
    top: 0;
    left: 412px;
    width: 400px;
    height: 400px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
    background-repeat: no-repeat;
    background-size: 800px 800px;
    background-color: #f8f8f8;
  }
  .middle {
    width: 400px;
    height: 400px;
    background: #f5f5f5;
    position: relative;
    cursor: move;
    .layer {
      width: 200px;
      height: 200px;
      background: rgba(0,0,0,.2);
      left: 0;
      top: 0;
      position: absolute;
    }
  }
  .small {
    width: 80px;
    li {
      width: 68px;
      height: 68px;
      margin-left: 12px;
      margin-bottom: 15px;
      cursor: pointer;
      &:hover,
      &.active {
        border: 2px solid @sealColor;
      }
    }
  }
}
</style>
